            &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         &\multicolumn{1}{c}{(5)}         &\multicolumn{1}{c}{(6)}         \\
\midrule
p\_air\_incident&      0.0107\sym{***}&      0.0107\sym{***}&      0.0106\sym{***}&      0.0107\sym{***}&      0.0103\sym{***}&      0.0106\sym{***}\\
            &   (0.00204)         &   (0.00204)         &   (0.00204)         &   (0.00207)         &   (0.00248)         &   (0.00258)         \\
\addlinespace
p\_referred  &                     &   -0.000833         &                     &                     &                     &                     \\
            &                     &   (0.00549)         &                     &                     &                     &                     \\
\addlinespace
p\_ee\_incident&                     &                     &     0.00487\sym{***}&     0.00495\sym{***}&     0.00596\sym{***}&     0.00607\sym{***}\\
            &                     &                     &   (0.00133)         &   (0.00135)         &   (0.00161)         &   (0.00161)         \\
\midrule
N           &     4158000         &     4158000         &     4158000         &     4012920         &     2949660         &     2753016         \\
r2          &      0.0241         &      0.0241         &      0.0242         &      0.0327         &      0.0379         &      0.0372         \\
ar2         &                     &                     &                     &                     &                     &                     \\
